New excited states in the halo nucleus 6He

X. Mougeot; V. Lapoux; W. Mittig; N. Alamanos; F. Auger; B. Avez; D. Beaumel; Y. Blumenfeld; R. Dayras; A. Drouart; C. Force; L. Gaudefroy; A. Gillibert; J. Guillot; H. Iwasaki; T. Al Kalanee; N. Keeley; L. Nalpas; E. C. Pollacco; T. Roger; P. Roussel-Chomaz; D. Suzuki; K. W. Kemper; T. J. Mertzimekis; A. Pakou; K. Rusek; J. A. Scarpaci; C. Simenel; I. Strojek; R. Wolski

doi:10.1016/j.physletb.2012.10.054

New excited states in the halo nucleus ⁶He

X. Mougeot, V. Lapoux^*, W. Mittig, N. Alamanos, F. Auger, B. Avez, D. Beaumel, Y. Blumenfeld, R. Dayras, A. Drouart, C. Force, L. Gaudefroy, A. Gillibert, J. Guillot, H. Iwasaki, T. Al Kalanee, N. Keeley, L. Nalpas, E. C. Pollacco, T. RogerP. Roussel-Chomaz, D. Suzuki, K. W. Kemper, T. J. Mertzimekis, A. Pakou, K. Rusek, J. A. Scarpaci, C. Simenel, I. Strojek, R. Wolski

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

The low-lying spectroscopy of ⁶He was investigated via the 2-neutron transfer reaction p(He8,t) with the ⁸He beam delivered by the SPIRAL facility at 15.4AMeV. The light charged particles produced by the direct reactions were measured using the MUST2 Si-strip telescope array. Above the known 2 ⁺ state, two new resonances were observed: at E ^*=2.6±0.3MeV (width Γ=1.6±0.4MeV) and at 5.3±0.3MeV with Γ=2±1MeV. Through the analysis of the angular distributions, they correspond to a 2 ⁺ state and to an L=1 state, respectively. These new states, challenging the nuclear theories, could be used as benchmarks for checking the microscopic inputs of the newly improved structure models, and should trigger development of models including the treatments of both core excitation and continuum coupling effects.

Original language	English
Pages (from-to)	441-446
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	718
Issue number	2
DOIs	https://doi.org/10.1016/j.physletb.2012.10.054
Publication status	Published - 5 Dec 2012
Externally published	Yes

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Mougeot, X., Lapoux, V., Mittig, W., Alamanos, N., Auger, F., Avez, B., Beaumel, D., Blumenfeld, Y., Dayras, R., Drouart, A., Force, C., Gaudefroy, L., Gillibert, A., Guillot, J., Iwasaki, H., Al Kalanee, T., Keeley, N., Nalpas, L., Pollacco, E. C., ... Wolski, R. (2012). New excited states in the halo nucleus ⁶He. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 718(2), 441-446. https://doi.org/10.1016/j.physletb.2012.10.054

@article{e4e4422364af440ea8bffc766c30bd31,

title = "New excited states in the halo nucleus 6He",

abstract = "The low-lying spectroscopy of 6He was investigated via the 2-neutron transfer reaction p(He8,t) with the 8He beam delivered by the SPIRAL facility at 15.4AMeV. The light charged particles produced by the direct reactions were measured using the MUST2 Si-strip telescope array. Above the known 2 + state, two new resonances were observed: at E *=2.6±0.3MeV (width Γ=1.6±0.4MeV) and at 5.3±0.3MeV with Γ=2±1MeV. Through the analysis of the angular distributions, they correspond to a 2 + state and to an L=1 state, respectively. These new states, challenging the nuclear theories, could be used as benchmarks for checking the microscopic inputs of the newly improved structure models, and should trigger development of models including the treatments of both core excitation and continuum coupling effects.",

keywords = "Borromean nucleus, He8(p,t), Resonant states, Transfer reaction",

author = "X. Mougeot and V. Lapoux and W. Mittig and N. Alamanos and F. Auger and B. Avez and D. Beaumel and Y. Blumenfeld and R. Dayras and A. Drouart and C. Force and L. Gaudefroy and A. Gillibert and J. Guillot and H. Iwasaki and {Al Kalanee}, T. and N. Keeley and L. Nalpas and Pollacco, {E. C.} and T. Roger and P. Roussel-Chomaz and D. Suzuki and Kemper, {K. W.} and Mertzimekis, {T. J.} and A. Pakou and K. Rusek and Scarpaci, {J. A.} and C. Simenel and I. Strojek and R. Wolski",

year = "2012",

month = dec,

day = "5",

doi = "10.1016/j.physletb.2012.10.054",

language = "English",

volume = "718",

pages = "441--446",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "2",

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Mougeot, X, Lapoux, V, Mittig, W, Alamanos, N, Auger, F, Avez, B, Beaumel, D, Blumenfeld, Y, Dayras, R, Drouart, A, Force, C, Gaudefroy, L, Gillibert, A, Guillot, J, Iwasaki, H, Al Kalanee, T, Keeley, N, Nalpas, L, Pollacco, EC, Roger, T, Roussel-Chomaz, P, Suzuki, D, Kemper, KW, Mertzimekis, TJ, Pakou, A, Rusek, K, Scarpaci, JA, Simenel, C, Strojek, I & Wolski, R 2012, 'New excited states in the halo nucleus ⁶He', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 718, no. 2, pp. 441-446. https://doi.org/10.1016/j.physletb.2012.10.054

TY - JOUR

T1 - New excited states in the halo nucleus 6He

AU - Mougeot, X.

AU - Lapoux, V.

AU - Mittig, W.

AU - Alamanos, N.

AU - Auger, F.

AU - Avez, B.

AU - Beaumel, D.

AU - Blumenfeld, Y.

AU - Dayras, R.

AU - Drouart, A.

AU - Force, C.

AU - Gaudefroy, L.

AU - Gillibert, A.

AU - Guillot, J.

AU - Iwasaki, H.

AU - Al Kalanee, T.

AU - Keeley, N.

AU - Nalpas, L.

AU - Pollacco, E. C.

AU - Roger, T.

AU - Roussel-Chomaz, P.

AU - Suzuki, D.

AU - Kemper, K. W.

AU - Mertzimekis, T. J.

AU - Pakou, A.

AU - Rusek, K.

AU - Scarpaci, J. A.

AU - Simenel, C.

AU - Strojek, I.

AU - Wolski, R.

PY - 2012/12/5

Y1 - 2012/12/5

N2 - The low-lying spectroscopy of 6He was investigated via the 2-neutron transfer reaction p(He8,t) with the 8He beam delivered by the SPIRAL facility at 15.4AMeV. The light charged particles produced by the direct reactions were measured using the MUST2 Si-strip telescope array. Above the known 2 + state, two new resonances were observed: at E *=2.6±0.3MeV (width Γ=1.6±0.4MeV) and at 5.3±0.3MeV with Γ=2±1MeV. Through the analysis of the angular distributions, they correspond to a 2 + state and to an L=1 state, respectively. These new states, challenging the nuclear theories, could be used as benchmarks for checking the microscopic inputs of the newly improved structure models, and should trigger development of models including the treatments of both core excitation and continuum coupling effects.

AB - The low-lying spectroscopy of 6He was investigated via the 2-neutron transfer reaction p(He8,t) with the 8He beam delivered by the SPIRAL facility at 15.4AMeV. The light charged particles produced by the direct reactions were measured using the MUST2 Si-strip telescope array. Above the known 2 + state, two new resonances were observed: at E *=2.6±0.3MeV (width Γ=1.6±0.4MeV) and at 5.3±0.3MeV with Γ=2±1MeV. Through the analysis of the angular distributions, they correspond to a 2 + state and to an L=1 state, respectively. These new states, challenging the nuclear theories, could be used as benchmarks for checking the microscopic inputs of the newly improved structure models, and should trigger development of models including the treatments of both core excitation and continuum coupling effects.

KW - Borromean nucleus

KW - He8(p,t)

KW - Resonant states

KW - Transfer reaction

UR - http://www.scopus.com/inward/record.url?scp=84869875159&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2012.10.054

DO - 10.1016/j.physletb.2012.10.054

M3 - Article

SN - 0370-2693

VL - 718

SP - 441

EP - 446

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 2

ER -

New excited states in the halo nucleus ⁶He

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